Topic Input Sequence for Compisite Letters

With Keyman, how can I implement the following? In this case, a, b, c, ... represent the basic characters and are much more frequent than m, n, o, p, q, r, ..., which are secondary ones. Therefore, the basic characters should be entered by one key stroke, and the usual way of using dead keys may not be desirable.)

Input sequence --- Desired Output
a ============> a
b ============> b
c ============> c
:
a a ===========> m
a a a =========> n
a a b =========> o
a b b =========> p
a b a =========> q
a b c =========> r
:
b a ===========> t
b a b =========> u
:
c a ===========> w

I found the solution.
Sorry to have bothered you guys by asking such a basic question.
I am such a beginner.
However, a nice new keyboard system emerging in near future will testify the powerfulness of Keyman.

JSB, I'm glad you were able to solve your question. We're happy to help if you need anything further.